There´s not sound, vibration or notification icon when receiving new message?
I) Check device Settings -> Apps/Apps management -> Handcent Next SMS -> Notifications ON.
II) Click on Handcent Settings -> All -> Notification settings -> Not receiving notification re-enable every channel.
III) Click Handcent settings>>All>>Notification settings>>"preview" and it shows the "test notification" window, check if there has any notification item from Next SMS after dropdown ,it means some apps block these notifications ,all the apps that have permission to block should at the list ,you can search "Notification access" at system settings ,then try to find did you install some security app that block Next SMS notification by mistaken . you can try to disable some of them to confirm which app affects Next SMS notification . After that issue should be solved. If not please contact us at help @ handcent.com.